package com.tssup.fesco.common.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 命名转换工具类
 * 
 * @author Haijun
 * @date 2016年7月27日
 * @see
 * @version
 */
public class NamingUtils {
	public static final char UNDERLINE = '_';

	public static String camelToUnderline(String param) {
		if (param == null || "".equals(param.trim())) {
			return "";
		}
		int len = param.length();
		StringBuilder sb = new StringBuilder(len);
		for (int i = 0; i < len; i++) {
			char c = param.charAt(i);
			if (Character.isUpperCase(c)) {
				sb.append(UNDERLINE);
				sb.append(Character.toLowerCase(c));
			} else {
				sb.append(c);
			}
		}
		return sb.toString();
	}

	public static String underlineToCamel(String param) {
		if (param == null || "".equals(param.trim())) {
			return "";
		}
		int len = param.length();
		StringBuilder sb = new StringBuilder(len);
		for (int i = 0; i < len; i++) {
			char c = param.charAt(i);
			if (c == UNDERLINE) {
				if (++i < len) {
					sb.append(Character.toUpperCase(param.charAt(i)));
				}
			} else {
				sb.append(c);
			}
		}
		return sb.toString();
	}

	public static String underlineToCamel2(String param) {
		if (param == null || "".equals(param.trim())) {
			return "";
		}
		StringBuilder sb = new StringBuilder(param);
		Matcher mc = Pattern.compile("_").matcher(param);
		int i = 0;
		while (mc.find()) {
			int position = mc.end() - (i++);
			// String.valueOf(Character.toUpperCase(sb.charAt(position)));
			sb.replace(position - 1, position + 1, sb.substring(position, position + 1).toUpperCase());
		}
		return sb.toString();
	}
}
